The correct answer is 'Frame', as Layer 2 of the OSI model, also known as the Data Link Layer, processes data in units called frames. A frame encapsulates packets with a header and a trailer to facilitate node-to-node communication across the physical layer. Ethernet frames are the most common type of Layer 2 frames, which include headers containing MAC addresses. The other answers, while related to networking, represent data units or terminologies used at different OSI model layers or different contexts, none of which pertain to the primary function of Layer 2.